1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Heating Calcium Chloride Dihydrate

  1. Jun 23, 2007 #1
    What physically happens to the water when you heat CaCl2*2H2O above it's decomposition temperature 175 deg C? Does the water just vaporize? Or does it partially dissolve some of the calcium chloride in an aqueous solution and then boil away?
  2. jcsd
  3. Jun 24, 2007 #2


    User Avatar
    Staff Emeritus
    Science Advisor

    The water evaporates and one then has an anhydrous salt.
  4. Jun 25, 2007 #3


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    If the temperature used to heat the salt is substantially below 175C, the water leaves as a vapor leaving a solid powdery anhydride. If the temperature is near or above 175C, the calcium chloride melts and the water bubbles away leaving a mass of chunky calcium chloride solid.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook